Improvement in gas-regulators



STATES JOHN B. OOOLIDGE, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN GAS-REGULATORS.

Specification forming part of Letters Patent No. 120,416, dated October 31, 1871 antedated October 14, 1871.

To all whom it may concern:

Be it known that I, JOHN B. CooLIDGE, of Boston, in the county of Suffolk and State of Massachusetts, have invented an Improved Gas- Regulator, used especially in valcauizing India rubber for dental purposes, of which the following is a specification:

This invention relates to a regulator of illuminating-gas feeding the burner under a boiler or vulcanizer used for the vulcanization of India rubber or other gums used for dental purposes. It consists of a metallic device, containing two separate chambers, the one above the other, and the chambers are joined by the upper being screwed upon the lower, and the device itself is screwed upon the top of the boiler or oven. The lower chamber is screwed upon the nipple or connecting-pipe upon the top of the boiler or vulcanizer, and is opened into the boiler through the connecting-pipe. The chamber is made of brass with a thin sheet-copper top, easily expanded upward when the pressure of heat in the boiler becomes intense. Upon this copper top is placed a steel spring in the form of a disk or plate, covering the top of the lower chamber or its central portion. This steel spring-plate rests against a shoulder within the upper chamber. Into the upper chamber, at its center, descends an adjustable tube, through a connecting-pipe, having a valve-seat, to which is joined at one end a hinged valve and at the other end a hinged lever, the lever lapping upon and moving the valve. This tube has an oriiice at its lower end open, except when closed by the valve operated by the pressure from below. There is also another pipeleadin g from the upper chamber, through which ilows the gas feeding the burner. The object of the device thus explained, of course, is to regulate the amount of gas iiowing to the burner and thus regulate the temperature in the boiler or vulcanizer, since steady temperature at a certain degree 0i' heat is indispensable in the production of good work; and when this desired temperature is reached the steady ilow of gas is regulated at that point, and the device may be left to do its work without watching the time necessary to vulcanize the dental wor Figure l represents in the dotted lines the top of the vulcanizer or boiler with its thermometer, and also the gas-regulator, in perspective. Fig.

2 represents a vertical section offthe regulator,

showing the exact arrangement of all the parts oi' the device when screwed upon the vulcanizer.

A represents the vulcanizer 5 B, the gas-regulator; a, the in-iiowing tube descending into the upper chamber 5 b, a screw-nut; c, the connecting-pipe of the upper chamber; d, the upper chamber n, the valve-seat on the end of the tube a with the hinged valve f and the hinged lever e connected therewith, g, the vent of the tube a; h,the steel spring-plate; t', the lower chamber 5 and k the escape-pipe. The accompan ying drawing gives a clear view of the regulator, Fig. l, as it is connected with the vulcanizer, and Fig. 2 the exact arrangement of its several parts. c is the tube through which ilows the gas from the gas-reservoir into the gas or upper chamber; it is movable up and down, as may be necessary with respect to the steel spring-plate It. Upon its lower end is a valve-seat, o, to one end of which is hinged the valve j', and to the other end the lever e; and g is a small orifice, through which the gas flows to the burner under 'the boiler or vulcauizer, and i is a chamber made of metal, the top of which is flexible copper or any suitable metahiirmlybrazed to the top of the rim or wall of the chamber.

The operation of the device may be explained as follows: Screw the regulator to the vulcanizer, connect the tube a by a ilexible tube or otherwise to the gas-reservoir, and let in the gas 5 it iills the chamber d and iiows out the tube k, which connects with the burner under the boiler or vulcanizer. When the vulcanizer becomes heated the chamber t', opening into the vulcanizer, becomes heated, of course, and the pressure of heat causes its copper top to expand or swell upward; this in turn pushes up the steel spring-plate It against the lever e, and the lever e pushes the valve fup, covering the orifice g, thus cutting oft' more or less the iiow of gas. That the gas may not be cut off entirely a small orifice may be made in the valve for in the tube a. As the iiow oi' gas is diminished the heat of course becomes less, and when a given temperature is attained, (say from 3100 to 3200 Fahrenheit, or at any desir-able degree,) by adjusting the movable tube a a uniform temperature may be maintained until the work is completed. When the tube a is adjusted the nut b holds it in place.

This device may be applied to ovens and boilers for other purposes, and is simple, inexpensive,

2. The steel spring-plate h in its connection and arrangement with the fexble metallic top of the chamber fi., and the lever e' operating upon the valve f, substantially in the manner and. for the purpose described.

JOHN B. GOOLIDGE.

Witnesses ROBT. M. KERK,

J. L. NEWTON. (64) 

